Pump



J. @..BRIGGSl PUMP.

APPLICATIONTILED JULY l, 1919` Patented Apr. 27, 1920.

UNITED. sTATEs PATENT oEEicE. i

JOHN oodKBAIN 4mueres,i or CUMBERTAND, ENGLAND, AssIGNoR To AEROI & GENERAL PUMPMANUEACTURING COMPANY, LIMITED.

PUMP.

To all whom 'it may concern: y

Be it known that I, JOHN COCKBAIN Braces, a .subject of the King of Great Britain, residing at East View, Workington, Cumberland, England, .lita/ue' invented new and useful Improvements in' or Relatingto Pumps, 'ot which thev following is a specification.

This invention relates to improvements 1n 'reciprocating pumps andit consists in the combination with a pump pliniger of-mechanism forimparting to thcfliittera reciproeating and turning movementglsuch mechanism comprising :a crank: operatively connectedfto the plunger and carried on a shaft,

located at right angles to the path of reciprocation of he said plunger. To permit of the combined. movements of rotation and reciprocation taking place Athe crank-pin is arranged to, slide longitudinally in the crank-shaft and the said sliding movementl of the rpin can be utilized as an auxiliary pump-plunger for forcing lubricant to the crank bearings. 'As will be understood the plunger is furnished with lateral f ports which coperate withports in the cylinder :for suction and discharge.

The pump 'is particularly suitable for use as a petrol pump on aero-engines in which the petrol is fed to the engine, under pres-v sure; and a pump for this purpose is illustrated in the accompanying drawing, 1n

l which Figure l is a longitudinal section, and Fig. 2 is a horizontal section on the line 2-2, Fig. 1. v i

F igs. 3 and l are respectively vertical sections on the lines 3 3' and 4-4, Fig. 1 approximately. Fig. 5 is a'central vertical section of the lower part of. the pump but withthe parts,l in a different position from that shown in- Fig. l. l

A indicates the pump`.plunger arranged to turn and reciprocate in' the cylinder `B which :is carried onthe bracket C.v The bracket C is connected to the driving engine.

* or motor byl a flangeD, and it also serves as a bearing for the crank-shaft E designed to be driven in-any suitable manner. The inner end of the -said crank-shaft is coned at F and is held inengagernent with a coned A seating in the bracket C by a spring G compressed between a collar H pinned to the crank-shaft, and the bottom of the cupped Specification of Letters Patent. 'Patented Apr. 27, '1920. Application led .111.111 1, 1919. Serial No. `307,983. v I i end of the bracket C. A ball bearing consisting of balls I and race-plates lJ is interposed betweenthe rotating collar H and the end of the stationary spring G.

K indicates the crank-pin which is connected to the plunger A by a pivot' pin L so as to swing transversely to the axis of the plunger, the 'said pin -als'o being capable of 4sliding longitudinally in the end of the stroke. The crank-pin Vis hollow` so that the oil 4can reach `the pivot pin L, and intermediate the ends of the said crank-pin is a discharge opening O which, during the com-l pression stroke of the crank-pin in the crank-shaft, communicates with a discharge conduit P inuthe latter so that oil is forced 1 into an annular groove Q, in the crank-shaft bearing and from thence spreads over the `bearing surface. The said groove Q also prevents or reduces the leakage of petrol epast the coned end F of the crank-shaft E,

.the oil pressure in `the groove being maintained in excess of the fluid pressure in the -pumping cylinder by meansof the auxiliary "plunger K; or the suction opening M may be connected directly to the groove Q, and

oil fed at high pressure through the. said .opening vvllhe pump. is double acting and ports,

.such as Rin the skirts constituting each endA of the plunger A, coperate with ports, such'as S, in the cylinder B, for the purpose of suction and discharge, asI indicated clearly-in Figs. 1,3 and 4;. 'T is the suction opening for the pump and YU, is the-discharge opening. The plungerskirts can be provided with longitudinal slots, iuch as .V, to insurewresilience ofthe said skirts and so that theya .function as scraper rings.

Caps IV are provided at each end of the `cylinder and are inwardly cupped to reduce the clearancev at each end of the plungei-.j

Having noW particularly described and ascertained the nature of the said invention and in What manner the same is to loe yperformed,-I declare that what I claim is v1. In a reciprocating pump, the combination with a plunger, of means for impart- `ingfa combined reciprocating and turning motion to the said plunger, -said means oonsisting of a shaft extending at right angles to the pathof reciprocation of the plunger,

' and a crank pin having one of its ends slidably mounted in one end of the shaft and its other end pivotally -connected to the pump plunger.

'2. A pump as claimed in claim 1, wherein the crank pin is hollow and a suction openn ing in the crank-shaft is provided adjacent pin,`for the purpose described'.

JOHN COCKBAIN v, BRIGGS. 

